摘要
The effect of aging on the microstructure and mechanical properties of AZ80 and ZK60 wrought magnesium alloys was studied with optical microscope and mechanical testers. The results demonstrate that both the tensile strength and elongation of AZ80 alloy increase firstly and then decrease as the aging temperature rises, the peak values appear when the aging temperature is 170 ℃ The hardness of ZK60 alloy increases firstly and then decreases as the aging temperature rises, and the hardness reaches its peak value at 170 ℃. However, the toughness of the alloy is just the opposite. Moreover, ZK60 alloy has good performances in both impact toughness and other mechanical properties at the aging temperature from 140 ℃ to 200 ℃.
借助光学显微镜和力学性能测试仪器,研究时效处理对AZ80和ZK60锻造镁合金的微观组织和力学性能的影响规。结果表明:AZ80镁合金的抗拉强度和伸长率随着时效温度的升高呈现先增加后下降的趋势,当时效温度为170 °C时,其抗拉强度和伸长率达到最大;ZK60镁合金的硬度随着时效温度的升高呈现先增加后下降的趋势,当时效温度为 170 °C时,其硬度达到最大,而其韧性正好呈现相反的趋势。此外,在140 200 °C的时效温度范围内,ZK60镁合金比AZ80镁合金具有更好的冲击韧性与其他力学性能。
基金
Projects(50735005,50605059)supported by the National Natural Foundation of China
Project(2007021026)supported by the Shanxi Provincial Science Foundation for Youths, China
Project(20081027)supported by the Development for Science and Technology in Higher Educational Institutes, China
